Title: Helium solubility in oxide nuclear fuel: Derivation of new correlations for Henry’s constant
Authors: COGNINI LUANAPIZZOCRI DAVIDEBARANI TOMMASOVAN UFFELEN PAULSCHUBERT ARNDTWISS THIERRYLUZZI LELIO
Citation: NUCLEAR ENGINEERING AND DESIGN vol. 340 p. 240-244
Publisher: ELSEVIER SCIENCE SA
Publication Year: 2018
JRC N°: JRC111578
ISSN: 0029-5493 (online)
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC111578
DOI: 10.1016/j.nucengdes.2018.09.024
Type: Articles in periodicals and books
Abstract: Helium plays an important role in determining nuclear fuel performance both in-pile (especially for MOX fuels and at high burnup) and in storage conditions. Predictive models of helium behaviour are therefore a fundamental element in fuel performance codes. These models are based on the accurate knowledge of helium diffusivity (addressed in a previous paper, Luzzi et al., Nucl. Eng. Des., 330 (2018) 265-271 ) and of helium solubility in oxide nuclear fuel. Based on all the experimental data available in the literature and after verification of the validity of Henry's law, we propose two correlations for Henry's constant, kH (1/atm^3 / MPa) kH = 1.8 10^25 exp(-0.41/kT) for powders and kH = 4.1 10^24 exp(-0.65/kT) for single crystals; with the Boltzmann factor 1/kT in (1/eV). The correlation for Henry's constant in single-crystals is of interest for meso-scale models describing helium behaviour at the level of fuel grains. The current lack of data for this fundamental property, especially for poly-crystalline samples, cries for new experiments.
JRC Directorate:Nuclear Safety and Security

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